How to enable the html display for horde webmail?

This step is only for VPS managed severs and cpanel/whm setup. 
Log into server via shell:
vi /usr/local/cpanel/base/horde/imp/config/mime_drivers.php

Look for code batch:
/* HTML driver settings */
'html' => array(
/* NOTE: Inline HTML display is turned OFF by default. */
'inline' => false,
'handles' => array(


Change 'inline' => false, to 'inline' => true,

Then run:
/usr/local/cpanel/bin/update_horde_config as root.

Done, all your customers can access emails with HTML output.
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